A triangle formed by the mandibular plane, Frankfort plane, and long axis of the lower central incisor. Proposed as a diagnostic aid by C.H. Tweed.
TWEED’S ANALYSIS:
Based on a triangle formed by the Frankfort horizontal (FH), the mandibular plane, and the plane drawn through the mandibular incisor axis to FH. The three angles in Tweed's analytical triangle are referred to as Frankfort mandibular angle (FMA), incisor mandibular plane angle (IMPA), and Frankfort mandibular incisal angle (FMIA).
Tweed determined that the means of these angles for a normal dentition, in well balanced faces, are 25 degrees for FMA, 87 degrees for IMPA, and 68 degrees for FMIA(這是理想的平衡數據). According to Tweed, the treatment goal is to achieve an FMIA angle of 65 to 68 degrees. In cases with a high FMA (30 degrees and above), a FMIA of 65 degrees is an acceptable goal. In cases with an FMA below 20 degrees, the FMIA should be 68 degrees.
Frankfort Horizontal plane - formed by connecting porion and orbitale.
Mandibular plane - Tweed uses a tangent to the lower border of the mandible
tweed triangle
dr. charles H. tweed
The Tweed Formula, Anchorage Preparation And Facial Esthetics
Craniofacial analysis of the Tweed Foundation in Angle Class II, division 1 malocclusion
Cephalometric analyis Overview(點入)
JPO Interviews Dr. Charles H. Tweed, Part 2
Where Teeth Should Be Positioned in the Face and Jaws and How To Get Them There
How We Got from There to Here and Back (Derek Mahony, Specialist Orthodontist )
Cephalometric software: a trial on the road(G. Floria*, A.R. Mazzocchi**)
adult mutilated dentition with anterior & lateral open bite
analysis of holdaway soft-tissue measurements in children between 9 and 12 years of age
computerized cephalometrics(這一篇裡面有提到tweed triangle的角度大小對矯正預後是否為好或壞的指標)
Dr. Robert Ricketts Interviewed by Dr. Larry White(part 1,2 ,3)
Where Teeth Should Be Positioned in the Face and Jaws and How To Get Them There
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